Brake shoe and method of making same



July 4, 1933. J. SNEED 1,916,851

BRAKE SHOE AND METHOD OF MAKING SAME Original Filed March 16, 1929 JOHN s/vzs-z-o Patented July 4, 1 33 hll'l'tfl STATES TENT ()FFHCE BRAKE SHOE AND METHOD OF MAKING- SAME Original application filed. March 16, 1929, Serial No. 347,515. Divided and this application filed April 10,

1930. Serial This invention relates to vehicle brakes, and particularly to an improved shoe and a method of making the same.

One object of this invention is to form a brake shoe from a single strip of stock.

Another object of this invention is to construct a one piece brake shoe from a strip of T section stock by rolling the strip into the form of a ring and cutting away portions thereof to provide the desired degree of flexibility.

Other objects are to provide an improved brake shoe formed from a strip of stock and having relatively rigid and relatively flexible portions; to arrange the elements of the shoe in such a manner as to form apoint of abrupt change in flexibility; and to provide an economical method of n'ialring brake shoes by which shoes of the size and shape desired may be produced with a high degree of accuracy and very little waste in large quantities.

Other objects and advantages of this invention will appear more fully in the following description.

In the accompanying drawing:

Fig. 1 is a perspective view of a strip of T-section stock.

Fig. 2 is an elevational view of the stock illustrating the first step in the formation of the brake shoe.

Fig. 3 is an elevational view of a completed brake shoe;

Fig. 1 is a fragmentary plan View of the shoe showing the construction of the ends thereof;

Fig. 5 is an elevational view of a modified form of brake shoe.

The brake shoe shown in Fig. 3 and the method disclosed herein are disclosed in my co-pending application Serial No. 347,515, flied March 16, 1929, from which this subject matter has been divioed. The shoe illustrated in Fig. 5 is disclosed in my co-pending application Serial No. 417,301, filed December 30, 1929.

In forming the improved brake shoe a strip 10 of hot-rolled T-section stock, such as shown in Fig. 1, is cut to the proper length 59 to form a brake shoe of the desired size and rolled into the form of asplit ring 11 having a radial flange 12 and aperipheral web 18. This operation is preferably performed by the machine and method disclosed in my co-pending application Serial No. 399,653, filed October 14, 1929.

The radial flange 12 of the ring 11 is then cut away to lend flexibility to the shoe in the places and to the degree desired, leaving a flange of the form shown either in Fig. 3 9 or Fig. 5. In Fig. 3 the radial flange comprises a part 14 of full depth at one end of the shoe and of decreasing depth to a point 15 toward the middle of the shoe, where the depth of the flange decreases abruptly. The 5 abrupt change in the depth of the flange at the point 15 makes a sharp division between relatively rigid and relatively flexible portions of the shoe and greatly reduces or eliminates the tendency of the brake to squeal. From the point 15 throughout the greater portion of the remainder of the shoe, depth of the flange is extremely shallow as indi cated at 16, so that this portion of the shoe has the greatest degree of flexibility. A small projecton 17 is left in the portion 16 of the flange, and is formed with an aperture 18 to receive an end of a retractor spring. A projection 19 is left near the flexible end of the shoe and is provided with an aperture 20 and a slot 21 which permit the attachment thereto of an adjustor such as disclosed in my aforesaid application Serial No. 347,515.

One or both ends of the peripheral web are preferably beveled, as indicated at 22, to prevent contact thereof with the apron or backing plate at the anchorage. The end of the portion 14 of the radial flange is formed with a recess 23 to seat against the anchorage when the shoe is to be used in the type of brake illustrated in my said application Serial No. 347,515. The opposite end of the shoe is maintained in position with respect to the anchorage by the abutment thereagainst of the end of the adjustor car ried by the projection 19.

In forming the brake shoe illustrated in Fig. 5, the radial flange 12 is cut entirely away in certain places, and is left with its original depth at other places. A portion 24 1 of full depth extends from one end of the shoe through the major portion of one side thereof, and terminates abruptly at the point 25. A full depth portion 26 extends from the other end of the shoe through a relatively'short distance, an apertured projection 27 is formed at the middle of the shoe, and a projection 28 is formed about degrees from the projection 27. The portions 26, 27, and 28 may be formed by cutting away the radial flange about them, or the entire flange may be cut away on the flexible side of the shoe and separate members welded or other-.

wise suitably secured to the peripheral web 13.

Itavill be evident that in both embodiments of the invention which have been described the brake shoe includes a relatively rigid portion and a relatively flexible portion with a point of abrupt change in flexibility therebetween. Any desired degree of rigidity may be obtained by making the radial flange of the proper depth, or by flanging the inner edge thereof, and any desired degree of flexibility may be obtained by cutting away the radial flange to a sufficient depth.

The improved method of forming the brake shoes is adapted to high speed production since it involves only rolling and cutting a single piece of metal. Sincethe radial flange is of uniform depth when the stock is rolled, the curvature and internal stresses in the resulting split ring are uniform throughout the same, and the size and shape of the completed brake shoe may be held within very narrow limits. The radial flange may be trimmed away as desired after the rolling operation without affecting the outer contour of the shoe. Since the rolling operation is preferably performed by an automatic machine, it will be evident that the machine may be set to produce rings of a desired size and shape and that thereafter the brake shoes produced will be of the required dimensions without further manipulation.

The method is not limited to the construction of the brake shoes illustrated herein, but may be practiced in the production of numerous other devices such as, for example, the brake shoe illustrated in my co-pending application Serial No. 417,302, filed December 30, 1929.

While the fOIegOing description is necessarily of a detailed character, it is to be understood that various modiflcations and re-arrangements'of parts may be resorted to without departing from the scope or spirit of the invention as defined in the following claims.

I claim 1. A brake shoe formed from T section stock rolled into a split ring with an inwardly extending reinforcing flange of uniform depth, said flange being cut away at various points to give different characteristics of flexillilility and rigidity to different sections of the s 0e.

2. A brake shoe formed from T section stock rolled to have a curved lining supporting part and an inwardly extending reinforcing flange of uniform depth, said flange being trimmed aft-er the shoe is curved to have less than its maximum depth at least in that portion of the shoe remote from the end, the trimmed flange changing in depth at least at one point abruptly.

3. A brake shoe comprising a substantially cylindrical web in the form of a split ring, and means reinforcing said web arranged in such a manner that different portions thereof have different degrees of flexibility, and one portion has a point of abrupt change in flexibility.

4. A brake shoe comprising a continuous web in the form of a split ring, and an inwardly extending flange integral with a portion of said web to render the same relatively rigid, another portion of said web being relatively flexible, the depth of said flange decreasing abruptly at one point.

5. The method of forming a brake shoe which consists in rolling stock of T section to the curve of the finished shoe While leaving the flange intact, and thereafter trimming the flange to reduce the rigidity at various points.

6. The method of forming a brake shoe which consists in rolling stock of T section into a split ring while leaving the flange intact and thereafter trimming the flange to vary the rigidity of the shoe throughout various parts according to the depth of the remaining flange.

7. The method of forming a brake shoe which includes rolling stock having angularly disposed parts to form a curved lining supporting surface and an inwardly extending reinforcing flange, and thereafter trimming said flange to vary the rigidity of said shoe.

8. The method of forming a brake shoe which consists in rolling stock having angularly disposed part to form a split ring having a cylindrical web and a radial flange, and thereafter trimming said radial flange to vary the rigidity of portions of said shoe.

9. A brake shoe formed from T-sect-ion stock rolled into a split ring with an inwardly extending reinforcing flange, said flange being cut away in that portion intermediate the ends of said brake shoe to give different characteristics of flexibility and rigidity to said shoe.

10. A brake shoe formed from T-section stock rolled to have a curved lining supporting part and an inwardly extending reinforcing flange, said flange being cut away in that portion intermediate the ends of said shoe to produce a shoe having different characteristics of flexibility and rigidity, one portion having a point of abrupt change in flexibility.

11. A brake shoe formed from T-section stock rolled into a split ring with an inwardly extending reinforcing flange and curved lining supporting part, said flange being cut away to produce substantially rigid sectors joined by said curved lining supporting part.

12. A split brake shoe formed from T-section stock including a curved lining supporting part and an inwardly extending reinforcing flange of uniform depth, said flange being cut away to produce reinforced sectors joined by an unreinforced portion of the shoe that is substantially flexible.

13. The method of forming a brake shoe which includes rolling stock having angularly disposed parts into a split ring and thereafter completely cutting away a portion of one of said angularly disposed parts in that portion between the shoe ends.

14. The method of forming a brake shoe which consists in rolling a strip of T-section stock having angularly disposed webs in the form of a split ring while leaving the angularly disposed parts intact and thereafter cutting away aportion of at least one of said webs intermediate the ends of the shoe to give different characteristics of flexibility and rigidity to different sections of said shoe.

15. The method of forming a brake shoe having sections that vary in flexibility one with respect to the other from T-section stock having angularly disposed Webs which consist in rolling the stock into a split ring while leaving the webs intact and thereafter cutting away a portion of one of the webs intermediate the ends of the shoe.

16. The method of forming a brake shoe having different characteristics of flexibility and ri idity at different sections of the shoe, which consists in rolling T-section stock having angularly disposed webs into a split ring to form a curved lining supporting surface and a reinforcing web while leaving the lining supporting surface and the web intact and without wrinkling the reinforcing flange and thereafter cutting away a portion of the reinforcing flange.

17. A brake shoe comprising a lining supporting portion and a radial reinforcing flange, said radial reinforcing flange being cut away at various points to the full depth thereof to produce reinforced shoe sectors joined by the lining supporting port-ion.

18. A circular brake shoe formed as a split ring which comprises a curved lining supporting portion and a radial reinforcing flange integral therewith, said radial flange being cut away at various points on one side of said shoe to produce reinforced sectors joined by the curved lining supporting surface, the other side of said shoe having a reinforcing flange of substantially constant depth extending approximately one half the circumference (if the whole shoe.

In testimony whereof I hereunto aflix my signature this 8th day of April, 1930.

JOHN SNEED.

CERTEFICATE 0F GQRREGTION.

iatent No. 1,916,851. July i 1933.

iosm sssso.

it is herebg certified iimi she above numbered patent was erroneousiy issued to the invemer said "Sees-d" whereas said patent should have been issued to "The Misiiami Steei Products Company 03" Eieveiand, Ohio, a corporation of Ghio, "as Trusiee or Steeliirauiie Brake ilerporaiien", as assignee of the entire interest in said invemion, as shown by the records of assignments in this office; and thsi iiie said Letters Patent should he read with this eosreetion there in that the same may eeniorm to the record of the ease intiie Patent Qifice,

Signed and; seaied inis 29th day sf August, A. D. 1933.

M. 3. Moore.

(Seai) Acting Commissioner of Patents. 

